Telephone-transmitter.



PATENTED JAN. 1, 1907.

A. LARSSION.

TELEPHONE TRANSMITTER.

APPLICATION FILED JAN.23 ,1906.

I, 0 4 A ay 7147/?2 /NVEN7'0H A Ifrcbl L arsson WITNESSES telephone-transmitter, and Fig. 2 is a top ALFREDLARSSON, on BUFFALO, NEW.YORK.

TE LEPHQNEfTRANSMITTER.

Specification of Letters Patent. Application filed Ja nuary 23, 1906. Serial No. 297,425.

' Patented Jan. 1, 1907.

To all whom it may concern/.2

. subject of the King of Sweden, residing at Be it known that I, ALFRED LARSSON, a

' Buffalo, New York, have invented certain new and useful Improvements in Telephone-' Transmitters, of which the following is a specification.

My invention relates to improvements in telephone-transmitters, and embodies the several novel features" and combinations of elements hereinafter described, and particularly pointed out iiifthe appended claims.

The principal object of my invention is to i provide means for "retainin'gthe telephonediaphragm firmly in position, dispensing entirely with the'use of screws for this purpose .meansw and em loying an element as retaining liich exerts a uniform pressure upon the eriphery of the diaphragm. T e second object of the invention is to afford the diaphragm protection against dust and moisture; and a further object is to provide within the transmitter itself a satisfactory and reliable spring contact for one of the electrodes. f

In the accompanying drawings; wherein like reference characters refer to like parts throughout, I have illustrated the preferred form of my invention.

Figure 1- is a vertical sectional view of a plan view of the retaining means for the diaphragm.

' Referringto the drawin s, 1 indicates the transmittenframe, to whic the cap 2, carrying the mouthpiece 3, is suitably secured by screws 4. The transmitter-diaphragm is designated 5 and rests upon the plane under surface 6 of an interior annular groove 7, having an overhanging flange 8, beveled upon its interior face.

The means employed for keeping the diaphragm 5 upon its seat 6 comprise a resili ent ring 9, open at 10 and provided near each end of the opening with an undercut portion 11, adapted to be engaged by a pair of pliers or like instrument. Upon its lower face the ring '5' is provided with an enlarged circumferential portion, 12, presenting in cross-section a substantial ogee shape. The ring is adapted to be readilysprung into the annular groove 7 and to rest firmly upon the diaphragm 5, holding the latter in position.

13 represents a second diaphragm of suit able waterproof and flexible material, prefer- Wall made of soft and flexible material, serving as a covering for the granules and carbon block. p I H 18 is a metal screw to which the carbon 15 is secured by a countersunk screw 19, over ablytin-foil, said diaphragm being situated which a felt washer 19is placed, the screw 18 beinginsulated by means of a disk 20 and '70 4 likewise having 5 an insulating cap 21, by means of whichthe screw 18 is insulatedfroni the casing 22. Screw 18-is threaded within the socket 23, which also serves as insulating means. i

As shown in Fig. 1, the screw 18 is longitudinally bored, a contact-pin 23 with a reduced point 24 being inserted into the bore. At the end opposite to the'point 24 the pin 23 is reduced at 25, said reduced portion being surrounded by a spiral spring 26. At a point substantially intermediate its thickportion the pin 23 -is providedwith a collar 27, serving to keep the spring in place.

In inserting the pin 23 into the bore the edges 30 of the bore are turned in after the pin has been inserted, and thus the latter cannot easily work out of place.

In assembling the instrument the diaphragm 5 is positioned to rest upon the plane surface 6. Thereafterthe retaining means 9 is pressed together by being grasped by pliers at the undercut ends 11 and then sprung into place over the diaphragm, the beveled portion of the overhanging'flange 8 directing the element 9 downwardly into its proper place in the annular groove 7, with its lower edge resting upon the diaphragm 5. The tin-foil diaphragm 13 is then placed upon the upper face of the overhanging flange 8, the cap 2 placed thereon and screwed down, and the instrument madeready for use.

If the instrument is to be disassembled, the several parts are loosened in the reverse order from that in which they were put into place.

It is evident that if the transmitter is associated with a suitable holder which has a contact corresponding to the point 24 the point 24 will make a spring contact with the corresponding contact in. such holder.

. larged periphery adapted to rest upon the portion therein and having an enlarged pe- 'ery adapted to rest uponlthe diaphragm.

. portion therein and having a periphery of enphragm in position comprising a resilient Having thus described my invention, what i I claim as new, and desire'to secure by Letters Patent, is

1. In telephone-transmitter, thecombination of a transmittere diaphragm and means for retaining the same in position comprising a ring having an enlarged periph- 2. In a telephone-transmitter, the combi- E nation of a transmitter-diaphragm and means for retaining the same inposition; comprising a resilient ring having an endiaphragm.

3. In a telephone-transmitter, the combi-, nation of a transmitter-diaphragm, and 1 means for retaining the same in position i comprising a resilient ring having a dependl ing periphery of enlarged diameter adapted to-rest upon and exert uniform pressure upon the peripheral portion of the diaphragm.

4. In a telephone-transmitter, the combination of a transmitter-diaphragm, and means for retaining the same in position comprising a circular element having an open larged diameteradapted to rest upon the diaphragm.

5. In a telephone-transmitter,the combination of a transmitter-diaphragm, and means for retaining the same in position comprising a resilient ring having anopen riphery, each end adjacent said open portion being undercut.

6. In a telephone-transmitter, the combination of a frame provided with an interior groove, a transmitter-diaphragm adapted to rest therein, and means for retaining the. dia phragm in position comprising aresilient ring having an enlarged periphery adapted to rest upon the diaphragm.

7. In a telephone-transmitter, the combination of a frame, a groove therein having a plane lower surface and an overhanging beveled flange, a tranSmitterdiaphragm dei signed to rest upon the plane surface in said groove, and means for retaining the diaring having an open portion therein and having a peripheral part of enlarged diameter.

8. In a telephone-transmitter, the combi- 5 nation of a frame, a groove therein, a diaj phragm adapted to rest in said groove and means for retaining the diaphragm in position-comprising a resilient ring having an open portiontherein and having a-peripheral 'dercut. 1 i

9. In a telephone-transmitter, the combi nation of a frame, and inner groove therein, a diaphragm adapted to rest in said groove, 1

10. In a telephone-transmitter, a diaphragm and a resilient. ring for retaining same in position, said ring presenting, at its periphery, a substantially ogee shape in cross-section.

1.1. In a telephone-transmitter, a diaphragm and a resilient ring, for retaining the same in position, said ring presenting at its periphery, a substantially 'ogee shape incross-section, and having an open portion; the ends adjacent said open portion being undercut.

12. In aL-telephOne-transmitterthe combination of a transmittor-diaphragm, means for. retaining the same in position'comprising a resilient ringhaving an enlarged periphery adapted to rest upon the diaphragm, and means for excluding moisture from said diaphragm'comprising a second diaphragm of metal superimposed upon said retaining means.

13. In a telephone-transmitter, the combination of a transmitter-diaphragm, means for retaining the same in'position comprising a resilient ring having an open portion there'- in and an enlarged periphery adapted to rest upon the diaphragm, and means for excluding moisture from said diaphragm comprising a second diaphragm of tin-foil superimposed uponsaid retaining means.

14. In a telepho ne-transmitter, a frame, a diaphragm within the frame, a carbon block below the diaphragm, a screw associated with said carbonblock and a pin inserted longitudinally into said screw, said pin being retained within said screw by first being inserted therein and thereafter having the edges of the bore, wherein said pin is contained, turned in.

15. In a telephone-transmitter, a frame, a transmitter-diaphragm within the frame, a carbon block below the diaphragm, a screw held to said carbon block, a pin inserted into said screw and a spiral spring surrounding a part of said pin, said pin being retained withi in said screw by first being inserted therein and thereafter having the edges of the bore, wherein'said pin is contained, turned in.

In testimony whereof I aflix my signature in presence of two witnesses.

KLAS WEMAN, HENRIETTA BABINGTON. 

